hibernate查询连接对象死活都是空，lazy也设置为false了，就是不知道为什么

[JonyShan]

学生表与学院，专业，班级是多对一关系，查询学生时，班级不为空，但是学院与专业对象都是空，配置文件lazy也设置为false了，求大神解决

下面时学生实体类

package com.itheima.bos.domain;

import java.util.HashSet;
import java.util.Set;

/**
 * Student entity. @author MyEclipse Persistence Tools
 */

public class Student implements java.io.Serializable {

	// Fields

	private String sid;
	private Grade grade;//班级
	private Specialty specialty;//专业
	private Academy academy;//学院
	private Teacher teacher;//指导教师
	private Graduationname graduationname;//毕设课题
	private String spassword;
	private String sname;
	private String ssex;
	private Integer sage;
	private Integer first;//开题成绩
	private Integer middle;//中期成绩
	private Integer finish;//结业成绩
	private Set replygroups = new HashSet(0);//答辩小组

	// Constructors

	/** default constructor */
	public Student() {
	}

	/** minimal constructor */
	public Student(String sid) {
		this.sid = sid;
	}

	/** full constructor */
	public Student(String sid, Grade grade, Specialty specialty,
			Academy academy, Teacher teacher, Graduationname graduationname,
			String spassword, String sname, String ssex, Integer sage,
			Integer first, Integer middle, Integer finish, Set replygroups) {
		this.sid = sid;
		this.grade = grade;
		this.specialty = specialty;
		this.academy = academy;
		this.teacher = teacher;
		this.graduationname = graduationname;
		this.spassword = spassword;
		this.sname = sname;
		this.ssex = ssex;
		this.sage = sage;
		this.first = first;
		this.middle = middle;
		this.finish = finish;
		this.replygroups = replygroups;
	}


	public String getGradename(){
		return grade.getClassName();
	}
	
	public String getSpecialtyname() {
		return this.specialty.getSpname();
	}
	
	public String getAcademyname() {
		return this.academy.getAcname();
	}
	
	public String getTeachername() {
		return this.teacher.getTname();
	}
	
	// Property accessors

	public String getSid() {
		return this.sid;
	}

	public void setSid(String sid) {
		this.sid = sid;
	}

	public Grade getGrade() {
		return this.grade;
	}

	public void setGrade(Grade grade) {
		this.grade = grade;
	}

	public Specialty getSpecialty() {
		return this.specialty;
	}

	public void setSpecialty(Specialty specialty) {
		this.specialty = specialty;
	}

	public Academy getAcademy() {
		return this.academy;
	}

	public void setAcademy(Academy academy) {
		this.academy = academy;
	}

	public Teacher getTeacher() {
		return this.teacher;
	}

	public void setTeacher(Teacher teacher) {
		this.teacher = teacher;
	}

	public Graduationname getGraduationname() {
		return this.graduationname;
	}

	public void setGraduationname(Graduationname graduationname) {
		this.graduationname = graduationname;
	}

	public String getSpassword() {
		return this.spassword;
	}

	public void setSpassword(String spassword) {
		this.spassword = spassword;
	}

	public String getSname() {
		return this.sname;
	}

	public void setSname(String sname) {
		this.sname = sname;
	}

	public String getSsex() {
		return this.ssex;
	}

	public void setSsex(String ssex) {
		this.ssex = ssex;
	}

	public Integer getSage() {
		return this.sage;
	}

	public void setSage(Integer sage) {
		this.sage = sage;
	}

	public Integer getFirst() {
		return this.first;
	}

	public void setFirst(Integer first) {
		this.first = first;
	}

	public Integer getMiddle() {
		return this.middle;
	}

	public void setMiddle(Integer middle) {
		this.middle = middle;
	}

	public Integer getFinish() {
		return this.finish;
	}

	public void setFinish(Integer finish) {
		this.finish = finish;
	}

	public Set getReplygroups() {
		return this.replygroups;
	}

	public void setReplygroups(Set replygroups) {
		this.replygroups = replygroups;
	}

}

学院实体类

public class Academy implements java.io.Serializable {

	// Fields

    private String acid;
    private String acname;
    private String university;
    private Set students = new HashSet(0);
    private Set specialties = new HashSet(0);
    private Set grades = new HashSet(0);
    private Set teachers = new HashSet(0);


   // Constructors

   /** default constructor */
   public Academy() {
   }

	/** minimal constructor */
   public Academy(String acid) {
       this.acid = acid;
   }
   
   /** full constructor */
   public Academy(String acid, String acname, String university, Set students, Set specialties, Set grades, Set teachers) {
       this.acid = acid;
       this.acname = acname;
       this.university = university;
       this.students = students;
       this.specialties = specialties;
       this.grades = grades;
       this.teachers = teachers;
   }

  
   // Property accessors

   public String getAcid() {
       return this.acid;
   }
   
   public void setAcid(String acid) {
       this.acid = acid;
   }

   public String getAcname() {
       return this.acname;
   }
   
   public void setAcname(String acname) {
       this.acname = acname;
   }

   public String getUniversity() {
       return this.university;
   }
   
   public void setUniversity(String university) {
       this.university = university;
   }

   public Set getStudents() {
       return this.students;
   }
   
   public void setStudents(Set students) {
       this.students = students;
   }

   public Set getSpecialties() {
       return this.specialties;
   }
   
   public void setSpecialties(Set specialties) {
       this.specialties = specialties;
   }

   public Set getGrades() {
       return this.grades;
   }
   
   public void setGrades(Set grades) {
       this.grades = grades;
   }

   public Set getTeachers() {
       return this.teachers;
   }
   
   public void setTeachers(Set teachers) {
       this.teachers = teachers;
   }

}

班级实体类

public class Grade  implements java.io.Serializable {


    // Fields    

     private String classId;
     private Specialty specialty;
     private Academy academy;
     private String className;
     private Set students = new HashSet(0);


    // Constructors

    /** default constructor */
    public Grade() {
    }

	/** minimal constructor */
    public Grade(String classId) {
        this.classId = classId;
    }
    
    /** full constructor */
    public Grade(String classId, Specialty specialty, Academy academy, String className, Set students) {
        this.classId = classId;
        this.specialty = specialty;
        this.academy = academy;
        this.className = className;
        this.students = students;
    }

   
    // Property accessors
    public String getSpname(){
    	return specialty.getSpname();
    }
    
    public String getAcademyname(){
    	return academy.getAcname();
    }
    
    public String getClassId() {
        return this.classId;
    }
    
    public void setClassId(String classId) {
        this.classId = classId;
    }

    public Specialty getSpecialty() {
        return this.specialty;
    }
    
    public void setSpecialty(Specialty specialty) {
        this.specialty = specialty;
    }

    public Academy getAcademy() {
        return this.academy;
    }
    
    public void setAcademy(Academy academy) {
        this.academy = academy;
    }

    public String getClassName() {
        return this.className;
    }
    
    public void setClassName(String className) {
        this.className = className;
    }

    public Set getStudents() {
        return this.students;
    }
    
    public void setStudents(Set students) {
        this.students = students;
    }
   


}

学生映射文件

<?xml version="1.0" encoding="utf-8"?>

<hibernate-mapping>
    <class name="com.itheima.bos.domain.Student" table="student"  lazy="false">
        <id name="sid" type="java.lang.String">
            <column name="sid" length="12" />
            <generator class="assigned" />
        </id>
        <many-to-one name="grade" lazy="false" class="com.itheima.bos.domain.Grade" fetch="select">
            <column name="grade" length="10" />
        </many-to-one>
        <many-to-one name="specialty" lazy="false" class="com.itheima.bos.domain.Specialty" fetch="select">
            <column name="specialty_id" length="15" />
        </many-to-one>
        <many-to-one name="academy" lazy="false" class="com.itheima.bos.domain.Academy" fetch="select">
            <column name="academy_id" length="15" />
        </many-to-one>
        <many-to-one name="teacher" lazy="false" class="com.itheima.bos.domain.Teacher" fetch="select">
            <column name="teacher_id" length="5" />
        </many-to-one>
        <many-to-one name="graduationname" lazy="false" class="com.itheima.bos.domain.Graduationname" fetch="select">
            <column name="graduationname" length="15" />
        </many-to-one>
        <property name="spassword" type="java.lang.String">
            <column name="spassword" length="20" />
        </property>
        <property name="sname" type="java.lang.String">
            <column name="sname" length="10" />
        </property>
        <property name="ssex" type="java.lang.String">
            <column name="ssex" length="2" />
        </property>
        <property name="sage" type="java.lang.Integer">
            <column name="sage" />
        </property>
        <property name="first" type="java.lang.Integer">
            <column name="first" />
        </property>
        <property name="middle" type="java.lang.Integer">
            <column name="middle" />
        </property>
        <property name="finish" type="java.lang.Integer">
            <column name="finish" />
        </property>
        <set name="replygroups" table="student_regroup"  >
            <key>
                <column name="student_id" length="15" not-null="true" />
            </key>
            <many-to-many lazy="false" entity-name="com.itheima.bos.domain.Replygroup">
                <column name="regroup_id" length="15" not-null="true" />
            </many-to-many>
        </set>
    </class>
</hibernate-mapping>

[jiajing1990_]

<many-to-one name="grade" lazy="false" class="com.itheima.bos.domain.Grade" fetch="select"> <column name="grade" length="10" /> </many-to-one> <many-to-one name="specialty" lazy="false" class="com.itheima.bos.domain.Specialty" fetch="select"> <column name="specialty_id" length="15" /> </many-to-one> <many-to-one name="academy" lazy="false" class="com.itheima.bos.domain.Academy" fetch="select"> <column name="academy_id" length="15" /> </many-to-one> <many-to-one name="teacher" lazy="false" class="com.itheima.bos.domain.Teacher" fetch="select"> <column name="teacher_id" length="5" /> 你的teacher不为空吗？ 单独用sql执行不为空吗？ 试试把名字写成一样的看看

[JonyShan]

都是有值的，名字写成一样指的是什么？ 这个是我在转json对象遇到的错误，一直搞不清楚为什么，有人说是延迟加载问题但是我已经把lazy改了，搞不清楚

----------
freemarker.template.TemplateModelException: Method public java.lang.String org.apache.commons.lang.exception.NestableRuntimeException.getMessage(int) threw an exception when invoked on net.sf.json.JSONException: java.lang.reflect.InvocationTargetException
	at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:130)
	at freemarker.ext.beans.SimpleMethodModel.get(SimpleMethodModel.java:138)
	at freemarker.core.DynamicKeyName.dealWithNumericalKey(DynamicKeyName.java:111)
	at freemarker.core.DynamicKeyName._getAsTemplateModel(DynamicKeyName.java:90)
	at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
	at freemarker.core.Expression.getStringValue(Expression.java:93)
	at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
	at freemarker.core.Environment.visit(Environment.java:221)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:221)
	at freemarker.core.IfBlock.accept(IfBlock.java:82)
	at freemarker.core.Environment.visit(Environment.java:221)
	at freemarker.core.IfBlock.accept(IfBlock.java:82)
	at freemarker.core.Environment.visit(Environment.java:221)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:221)
	at freemarker.core.Environment.process(Environment.java:199)
	at freemarker.template.Template.process(Template.java:259)
	at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:845)
	at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:567)
	at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
	at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:233)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
	at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
	at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
	at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
	at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
	at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
	at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
	at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
	at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1008)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
	at freemarker.ext.beans.SimpleMemberModel.unwrapArguments(SimpleMemberModel.java:86)
	at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:106)
	... 61 more